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12. jumlah sudut tegak lurus adalah 180 derajat
3x +2x = 180
5x = 180
x = 180 : 5
x = 36 derajat
<BOC = 2x
= 2 x 36 = D. 72 derajat
13. <SDC + <ADC = 180 derajat
<ADC = <ABC
180 - 65 = 115
jadi <ABC adalah A.115 derajat
14. <ABD + <CBD = 180
(5a+4) + (7a+8) = 180
5a + 7a + 4 + 8 = 180
12a + 12 = 180
12a =180 - 12
12a = 168
a = 168 : 12
a = 14
<CBD = (7a + 8)
= 7. 14 + 8
= B. 106 derajat
15.jumlah sudut pada segitiga = 180 derajat
(2x + 5) + 25 + 3x = 180
2x + 3x + 5 +25 = 180
5x + 30 = 180
5x = 180 - 30
5x = 150
x = 150 : 5
x = 30
<A = 2x + 5
= 2. 30 + 5
= C. 65 derajat
16. <BCA = 180 - 30 - 90
= 60 derajat
<ACD = 180 - 60
= C.120 derajat
17. <CMN = <ALK
<BLK + <ALK = 180
2x + 40 + 3x + 50 = 180
2x + 3x + 40 + 50 = 180
5x + 90 = 180
5x = 180 - 90
5x = 90
x = 90 : 5
x = 18
<ALM = <BLK
2x + 40
= 2 . 18 + 40
= 76
jadi besar <ALM = C. 76 derajat
semoga membantu :)